And who have fallen away, to be brought back to repentance. To their loss they are crucifying the Son of God all over again and subjecting him to public disgrace. (NIV)
If they then deviate from the faith and turn away from their allegiance--[it is impossible] to bring them back to repentance, for (because, while, as long as) they nail upon the cross the Son of God afresh [as far as they are concerned] and are holding [Him] up to contempt and shame and public disgrace. (AMP)
If they shall fall away, to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put him to an open shame. (KJV)